       (b/transform (fn [symbol-str-seq]
         (if @group-vars-by-object-type-atom
           (let [n-s (selection (id :ns-lb))
+                ns-list (selection (id :ns-lb) {:multi? true})
                 n (and n-s (find-ns (symbol n-s)))
                 v (selection (id :vars-cbx))
                 fqns? (#{"all-publics" "search-all-docs"} v)]

    (b/bind
      (apply b/funnel
        [(b/selection (id :vars-cbx))
         (b/selection (id :ns-lb))
         (id :vars-filter-tf)
         vars-lb-refresh-atom
         group-vars-by-object-type-atom])
      (b/transform (fn [o]
        (let [n-s (selection (id :ns-lb))
              n (and n-s (find-ns (symbol n-s)))
              v (selection (id :vars-cbx))
              f (get vars-cbx-value-fn-map v)]

      (b/property (id :var-trace-btn-action) :enabled?))
    ;; dis/enable require-btn, update fqn in doc-tf, scroll within view
    (b/bind
      (b/selection (id :ns-lb) {:multi? true})
        (b/tee
          (b/bind
            (b/transform (fn [ns-list]
              (if (and ns-list (= 1 (count ns-list)) (some #(= (first ns-list) %) @all-ns-unloaded-atom))
                true
                false)))
            (b/property (id :ns-require-btn-action) :enabled?))
          (b/bind
            (b/transform (fn [ns-list]
              (let [ns-str (and ns-list (first ns-list))]
                (if (and ns-str (find-ns (symbol ns-str)))
                  true
                  false))))
            (b/property (id :ns-trace-btn-action) :enabled?))
          (b/bind
            (b/transform (fn [ns-list]
              (let [ns-str (and ns-list (first ns-list))]
                (if (and ns-str (find-ns (symbol ns-str)))
                  true
                  false))))
            (b/property (id :ns-untrace-btn-action) :enabled?))
          (b/bind
            (b/transform (fn [ns-list]
              (let [ns-str (and ns-list (first ns-list))]
                (if (and ns-str (find-ns (symbol ns-str)))
                  (fqname ns-str)
                  ""))))
            (b/property (id :doc-tf) :text))))
    ;; require-btn pressed =>
    ;; (require ns), update (un-)loaded atoms, select loaded, select ns.
